File gcc7-pr93888.patch of Package cross-ppc64le-gcc7.30294

commit 64ba6d17022eeb65f56f0b141c2640f9ab938f97
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Mar 4 12:59:04 2020 +0100

    inliner: Copy DECL_BY_REFERENCE in copy_decl_to_var [PR93888]
    
    In the following testcase we emit wrong debug info for the karg
    parameter in the DW_TAG_inlined_subroutine into main.
    The problem is that the karg PARM_DECL is DECL_BY_REFERENCE and thus
    in the IL has const K & type, but in the source just const K.
    When the function is inlined, we create a VAR_DECL for it, but don't
    set DECL_BY_REFERENCE, so when emitting DW_AT_location, we treat it like
    a const K & typed variable, but it has DW_AT_abstract_origin which has
    just the const K type and thus the debugger thinks the variable has
    const K type.
    
    Fixed by copying the DECL_BY_REFERENCE flag.  Not doing it in
    copy_decl_for_dup_finish, because copy_decl_no_change already copies
    that flag through copy_node and in copy_result_decl_to_var it is
    undesirable, as we handle DECL_BY_REFERENCE in that case instead
    by changing the type.
    
    2020-03-04  Jakub Jelinek  <jakub@redhat.com>
    
            PR debug/93888
            * tree-inline.c (copy_decl_to_var): Copy DECL_BY_REFERENCE flag.
    
            * g++.dg/guality/pr93888.C: New test.

diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index 23941dade55..59798ec0454 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -5929,6 +5929,7 @@ copy_decl_to_var (tree decl, copy_body_data *id)
   TREE_READONLY (copy) = TREE_READONLY (decl);
   TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (decl);
   DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (decl);
+  DECL_BY_REFERENCE (copy) = DECL_BY_REFERENCE (decl);
 
   return copy_decl_for_dup_finish (id, decl, copy);
 }